Effect of Design Parameters on the Flexural Strength of Reinforced Concrete Sandwich Beams

Chakrawarthi, Vijayaprabha; Jesuarulraj, Leon Raj; Avudaiappan, Siva; Rajendren, Divya; Amran, Mugahed; Guindos, Pablo; Roy, Krishanu; Fediuk, Roman; Vatin, Nikolai

doi:10.3390/cryst12081021

Cited by 8 publications

(4 citation statements)

References 56 publications

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“…The temperature distribution throughout the element will have little different between the layered steel and the reinforcement. But, the effect to the reinforcing steel can be considered minor [8][9][10].…”

Section: Concrete Framementioning

confidence: 99%

Constitutive Model of Concrete Frame Structure Under Localized Fire Simulations

Murtiadi¹,

Mahendra²,

Karyawan³

et al. 2022

Proceedings of the First Mandalika International Multi-Conference on Science and Engineering 2022, MIMSE 2022 (Civil and Archit

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In recent decades, special considerations have been given to the use of fire safety analysis on modern concrete buildings. The considerations include the stability of building which providing sufficient time for the occupants to evacuate and for firefighting. This paper is mainly concerned with the performance of concrete frame structure exposed to localized fire. From the simplified model, load carrying mechanism of concrete frame is identified and several design implications are discussed. Frame model in present analyses constructed of normal-strength reinforced concrete beams and high-strength reinforced concrete columns represented typical commercial office building. All elements of the frame are modeled using 3D tetrahedral coupled-field solid element defined by ten nodes with four degree of freedom. Temperature response predicted from previous researchers and loadings represented total design load at the fire limit state are applied. Constitutive model in a full thermal strain-stress analysis is employed on simple empirical formula. Three-dimensional finite element computer model using ANSYS considering transient effects gave reasonable results. The results indicate that behavior of individual isolated member accommodated by the current codes is different from the behavior of complete structure. Therefore, developing fire engineering analysis from the behavior of complete structures is strongly recommended.

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Section: Concrete Framementioning

confidence: 99%

Constitutive Model of Concrete Frame Structure Under Localized Fire Simulations

Murtiadi¹,

Mahendra²,

Karyawan³

et al. 2022

Proceedings of the First Mandalika International Multi-Conference on Science and Engineering 2022, MIMSE 2022 (Civil and Archit

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“…Viscoelastic materials like rubber, aluminum, polymeric foam, honeycomb, lattice truss, and corrugated patterns are the most commonly used cores. [5][6][7] Due to the susceptibility to humidity, foam cores are not advised for use in aviation applications. The porous honeycomb is the core that received most of the attention from analytical, numerical, and experimental research areas.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Structural Integrity of Composite Sandwich Beams Using Viscoelastic Bonding with Tapered Epoxy Reinforcement

Shirale,

Bhalchandra

2024

Korean. J. Mater. Res.

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Composite laminates are used in a wide range of applications including defense, automotive, aviation and aerospace, marine, wind energy, and recreational sporting goods. These composite beams still exhibit problems such as buckling, local deformations, and interlaminar delamination. To overcome these drawbacks, a novel viscoelastic autoclave bonding with tapered epoxy reinforcement polyurethane films is proposed. In existing laminates, compression face wrinkling and interlaminar delamination is caused in the sandwich beam. The unique viscoelastic autoclave spunbond interlayer bonding is designed to prevent face wrinkling and absorb and distribute stresses induced by external loads, thereby eliminating interlaminar delamination in the sandwich beam. Also, the existing special reinforcement causes stress concentrations, and the core is not effectively connected, which directly affects the stiffness of the beam. To address this, a novel tapered epoxy polyurethane reinforcement adhesive film is proposed, whose reinforcement thickness gradually tapers as it enters the core material. This minimizes stress concentrations at the interface, preventing excessive adhesive squeeze-out during the bonding process, and improves the stiffness of the beam. Results indicate the proposed model avoids the formation of micro cracks, interlaminar delamination, buckling, and local deformations, and effectively improves the stiffness of the beam.

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“…The basis for the present study is to require special consideration by the designer for fire safety in buildings [7,8]. Since concrete is a good insulator and a non-combustible material, this also applies to concrete structures which conventionally have a favorable position in the building industry [9][10][11][12]. Consequently, the understanding of its behavior under elevated temperature is necessary for safe design and reliable analysis.…”

Section: Introductionmentioning

confidence: 99%

Performance of Concrete Building Structure Exposed to Localized Fire

Murtiadi¹,

Akmaluddin²

2023

cea

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Concrete structures have a favorable position in the building industry with regard to their performance of fire resistance. The understanding of their behavior is essential for reliable analysis and design. This paper is mainly concerned with concrete building performance subjected to localized fire arrangement. Special attention has been given to the finite element model of a seven-story concrete building representing a typical commercial office building designed to European Standard. Very large displacements happened on horizontal direction of the floor slabs due to thermal expansions. The large displacement induced lateral movement of the floor slabs and created additional moments to external columns. Design engineers should ensure that the external columns have ability to accommodate lateral displacements during fire. Although, the thin external columns of the model can withstand these movements due to beneficial effect of membrane action developed to the floor slabs. Present analysis indicates that the performance of the whole structure is substantially different from the single isolated structural member behavior during fire. Although the current design procedures are conservative, design engineers have to consider the detrimental and beneficial effects of lateral slabs' thermal expansion in complete structure.

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Effect of Design Parameters on the Flexural Strength of Reinforced Concrete Sandwich Beams

Cited by 8 publications

References 56 publications

Constitutive Model of Concrete Frame Structure Under Localized Fire Simulations

Constitutive Model of Concrete Frame Structure Under Localized Fire Simulations

Enhancing Structural Integrity of Composite Sandwich Beams Using Viscoelastic Bonding with Tapered Epoxy Reinforcement

Performance of Concrete Building Structure Exposed to Localized Fire

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